package com.write.program.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Endstart
 * Date: 2020-03-12
 * Time: 14:54
 */
public class Md5Util {

    public static String getMd5(byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        MessageDigest messageDigest;
        String encodestr = "";
        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.update(bytes);
            encodestr = byte2Hex(messageDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return encodestr;
    }

    /**
     * 将byte转为16进制
     *
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes) {
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i = 0; i < bytes.length; i++) {
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length() == 1) {
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

}
